/Engine/Plugins/MovieScene/MovieSceneTextTrack/Source/MovieSceneTextTrack/Public/MovieSceneTextChannel.h
Compute the effective range of this channel, for example, the extents of its key times
A range that represents the greatest range of times occupied by this channel, in the sequence's frame resolution
virtual [TRange](API\Runtime\Core\Math\TRange)< [FFrameNumber](API\Runtime\Core\Misc\FFrameNumber) > ComputeEffectiveRange() const